2 * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 #include <common/time.h>
19 #include <common/macros.h>
27 int timespec_to_ms(struct timespec ts
, unsigned long *ms
)
29 unsigned long res
, remain_ms
;
31 if (ts
.tv_sec
> ULONG_MAX
/ MSEC_PER_SEC
) {
33 return -1; /* multiplication overflow */
35 res
= ts
.tv_sec
* MSEC_PER_SEC
;
36 remain_ms
= ULONG_MAX
- res
;
37 if (ts
.tv_nsec
/ NSEC_PER_MSEC
> remain_ms
) {
39 return -1; /* addition overflow */
41 res
+= ts
.tv_nsec
/ NSEC_PER_MSEC
;
47 struct timespec
timespec_abs_diff(struct timespec t1
, struct timespec t2
)
49 uint64_t ts1
= (uint64_t) t1
.tv_sec
* (uint64_t) NSEC_PER_SEC
+
50 (uint64_t) t1
.tv_nsec
;
51 uint64_t ts2
= (uint64_t) t2
.tv_sec
* (uint64_t) NSEC_PER_SEC
+
52 (uint64_t) t2
.tv_nsec
;
53 uint64_t diff
= max(ts1
, ts2
) - min(ts1
, ts2
);
56 res
.tv_sec
= diff
/ (uint64_t) NSEC_PER_SEC
;
57 res
.tv_nsec
= diff
% (uint64_t) NSEC_PER_SEC
;
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